---
title: CDN browser SDK installation guide
description: CDN RUM browser SDK enables quick and efficient deployment of monitoring tools by embedding a script tag in your HTML
url: https://coralogix.com/docs/user-guides/rum/sdk-installation/javascript/cdn-browser/
product: rum
feature: Browser SDK
feature_id: browser-sdk
feature_identifier: rum/browser-sdk
last_updated: '2026-10-21'
---

# CDN browser SDK installation guide

As part of our [Real User Monitoring](https://coralogix.com/docs/user-guides/rum/getting-started/real-user-monitoring.md) (RUM) toolkit, Coralogix offers multi-faceted Error Tracking, enabled by our **CDN RUM Browser SDK**.

## Overview

Using a CDN RUM browser SDK enables quick and efficient deployment of monitoring tools by simply embedding a script tag in your HTML, without needing to install packages or set up a build system. This approach offers significant advantages: it minimizes setup time, leverages globally distributed CDN infrastructure for low-latency script loading, and benefits from browser-level caching, which can reduce load times and improve performance. Additionally, it allows developers to integrate RUM into static or legacy sites without major codebase changes, making it a convenient solution for capturing real-world user performance and behavior data with minimal effort.

For information on our **NPM Browser SDK**, view [this page](https://coralogix.com/docs/user-guides/rum/sdk-installation/javascript/npm-browser.md).

## What you need

* **RUM key**: a Send-Your-Data key with the **SendRUMData** role preset. [Create it](https://coralogix.com/docs/user-guides/account-management/api-keys/api-keys.md#create-an-api-key) before the setup below. The key is public, and the preset is standalone, so it can't be combined with other presets. Don't use **SendData**: it carries no RUM permissions, and keys created with it must stay secret, so they don't belong in client code.

## Configuration

Select the exact version required for your use case.

### Specific version (recommended)

By default, the CDN is built using the ES2015 (ES6) standard.

Use a specific browser version (`https://cdn.rum-ingress-coralogix.com/coralogix/browser/[version]/coralogix-browser-sdk.js`). Replace `[version]` with a version from our [Releases page](https://www.npmjs.com/package/@coralogix/browser?activeTab=versions).

Note

The latest CDN version option is no longer available. Use an explicit version instead.

### ES5-compatible version

For legacy environment support, ensure you're using the ES5-compatible version (`https://cdn.rum-ingress-coralogix.com/coralogix/browser/[version]/coralogix-browser-sdk.es5.js`).

## Adding CDN script to your application.

```
<head>

  ...

  <script src="https://cdn.rum-ingress-coralogix.com/coralogix/browser/[version]/coralogix-browser-sdk.js"></script>

</head>
```

## Initialization

Initialize the SDK using a JS or TS file.

### JS file

```
window.CoralogixRum.init(...);
```

### TS file

```
window.CoralogixRum.init(...);



// In case of warning from TSC

declare global {

  interface Window {

    CoralogixRum: CoralogixOtelWebType;

  }

}
```

## SDK configuration and features

This install path uses the Browser SDK, so its options and features are documented once on the SDK's own pages rather than repeated here:

|               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| ------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Configuration | [Options](https://coralogix.com/docs/user-guides/rum/sdk-installation/javascript/browser-sdk/configuration/options.md) - including `ignoreErrors`, `ignoreUrls` and anonymous users<br />[Sampling](https://coralogix.com/docs/user-guides/rum/sdk-installation/javascript/browser-sdk/configuration/sampling.md)<br />[Before send and transport](https://coralogix.com/docs/user-guides/rum/sdk-installation/javascript/browser-sdk/configuration/before-send-and-transport.md) |
| Features      | [Logs and errors](https://coralogix.com/docs/user-guides/rum/sdk-installation/javascript/browser-sdk/features/logs-and-errors.md) - including Web Vitals and the TBT metric<br />[Session recording](https://coralogix.com/docs/user-guides/rum/sdk-installation/javascript/browser-sdk/features/session-recording.md)                                                                                                                                                            |

## Additional resources

|               |                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| ------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Documentation | [Real User Monitoring](https://coralogix.com/docs/user-guides/rum/getting-started/real-user-monitoring.md)<br />[RUM Integration Package](https://coralogix.com/docs/user-guides/rum/sdk-installation/overview.md)<br />[Error Tracking](https://coralogix.com/docs/user-guides/rum/product-features/error-tracking.md)<br />[Error Tracking: User Manual](https://coralogix.com/docs/user-guides/rum/product-features/error-tracking-user-manual.md) |